I just bought an Atari 400 recently, and I thought I'd get some more 8-bit carts to "celebrate". Here are the carts I'm looking for; games I really want are marked with an asterisk. I prefer all carts to be loose.
Ace of Aces
Activision Decathlon
Airball
Archon
*Ballblazer
Barnyard Blaster
*Beamrider
Blue Max
*Caverns of Mars
Choplifter (Broderbund version)
Crime Buster
*Dark Chambers
*Deluxe Invaders
Desert Falcon
The Dreadnaught Factor
Fight Night
*Final Legacy
Gateway to Apshai
H.E.R.O.
Jumpman Jr.
*Jungle Hunt
K-Razy Shootout
Kaboom
Karateka
Keystone Kapers
Megamania
Midnight Magic
Miner 2049'er
One-on-One Basketball
*Pitfall II
Protector II
*Rescue on Fractalus
*Shamus
Spy Hunter
*Star Raiders II
Star Wars: The Arcade Game
*Track & Field
Wizard of Wor
Zaxxon
Zenji
Zone Ranger